Raşit Turan

E-mail
turanr@metu.edu.tr
Department
Department of Physics
Scopus Author ID
Web of Science Researcher ID
Investigation of seeded vertical gradient freeze (VGF) growth of CdZnTe bulk crystals
Balbaşı, Özden Başar; Ünal, Mustafa; Genç, Ayşe Merve; ÇELİK, GÜLÇİN; Parlak, Mehmet; Turan, Raşit (2022-04-15)
© 2022 Elsevier B.V.Due to the requirement for superheating above the melting point in the homogenization process of CdZnTe material, complete seed melting remains as a significant problem for the seeded vertical gradient ...
Interface stability problem towards the end of THM growth of cadmium zinc telluride crystals
Ünal, Mustafa; Balbaşı, Özden Başar; Genç, Ayşe Merve; Parlak, Mehmet; Turan, Raşit (2022-04-15)
Growth of CdZnTe crystals by Travelling Heater Method (THM) is widely investigated by different groups. Interface shape and stability are critical parameters for the successful growth of high-quality CZT crystals. Even tho...
Integration of graphene with GZO as TCO layer and its impact on solar cell performance
Zan, Recep; Olgar, Mehmet Ali; Altuntepe, Ali; Seyhan, Ayse; Turan, Raşit (2022-01-01)
In this study, we investigated the impact of incorporating graphene with Ga-doped ZnO (GZO) when employing them as a TCO layer on Si-based solar cell. GZO thin films with various thicknesses (50-450 nm) were fabricated by ...
Physical device simulation of dopant-free asymmetric silicon heterojunction solar cell featuring tungsten oxide as a hole-selective layer with ultrathin silicon oxide passivation layer
Mehmood, Haris; Nasser, Hisham; Zaidi, Syed Muhammad Hassan; Tauqeer, Tauseef; Turan, Raşit (2022-01-01)
The dopant-related issues are amongst the major performance bottleneck in crystalline silicon solar cells that can be alleviated via implementation of dopant-free layers. This work presents the implementation of tungsten o...
Spreading Resistance Modeling for Contact Resistivity Extraction in Ohmic Multilayer Structures With Circular Electrodes
Turkay, Deniz; Tsoi, Konstantin; Donercark, Ergi; Turan, Raşit; Yerci, Selçuk (2021-12-01)
Contacts featuring multiple layers of materials in combination with metal electrodes enabled record-high power conversion efficiencies for solar cells in recent years. Minimizing the contact resistivity in these multilayer...
Hybrid transparent conductive electrode structure for solar cell application
Altuntepe, Ali; Olgar, Mehmet Ali; Erkan, Serkan; Hasret, Onur; Kececi, Ahmet Emin; Kokbudak, Gamze; TOMAKİN, MURAT; Seyhan, Ayse; Turan, Raşit; Zan, Recep (2021-12-01)
This study draws on our experiences with graphene to perform a hybrid TCO structure composed of AZO and graphene. We first set out to enhance the electrical and optical properties of AZO to enable its use especially in the...
Fourteen percent efficiency ultrathin silicon solar cells with improved infrared light management enabled by hole-selective transition metal oxide full-area rear passivating contacts
Nasser, Hisham; Borra, Mona Zolfaghari; Çiftpınar, Emine Hande; Eldeeb, Basil; Turan, Raşit (2021-11-01)
The present study investigates the application of hole-selective transition metal oxide (TMO) layers (MoOx, V2Ox, and WOx) with silver (Ag) as full-area rear contact to 22.5 mu m-thick low-quality Cz p-type c-Si solar cell...
Spreading resistance modeling for rapid extraction of contact resistivity with a four-point probe
Turkay, Deniz; Tsoi, Konstantin; Donercark, Ergi; Turan, Raşit; Yerci, Selçuk (2021-09-15)
Extraction of contact resistivity (ρc) with the four-point probe (4PP) method requires considerably fewer fabrication and measurement steps compared to conventional alternatives (e.g. the transfer length method, TLM). Yet,...
Laser Crystallization of Amorphous Ge Thin Films via a Nanosecond Pulsed Infrared Laser
Korkut, Ceren; Cinar, Kamil; Kabacelik, Ismail; Turan, Raşit; Kulakci, Mustafa; Bek, Alpan (2021-08-01)
Understanding the dynamics of the laser crystallization (LC) process of Ge thin films by nanosecond (ns) pulsed infrared (IR) lasers is important for producing homogeneous, crack-free crystalline device-grade films for use...
Laser Induced Periodic Surface Structured c-Si Solar Cell with more than 16% efficiency
Goodarzi, Arian; Candemir, Ozun; Nasser, Hisham; Borra, Mona Zolfaghari; Genc, Ezgi; Çiftpınar, Emine Hande; Bek, Alpan; Turan, Raşit; Pavlov, Ihor (2021-06-01)
Crystalline-Si (c-Si) based solar cells (SC) efficiency remains one of the most challenging part in photovoltaic industry. Besides of the thermodynamical limits, the optical losses due to indirect band-gap structure of the...
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